Improvement in valve-gears for engines



0. BROWN. Valve-Gear for Engines.

Pate n ted April-9,1878.

M mu

NJETHS, PHDTO-LITHOGRAFHER, WASHINGTON. D. C-

To ham/it may concern:

B t known that I, CHARLES BROWN, of Wi thur, in the canton of Zurich andRepub of Switzerland, have invented a new eful Improvement inValve-Motion,

u specification and accompanying gs, in which the figures are sideelevaf the valve-motion embodying my inar letters of reference indicatecorrespon 1g parts in the two figures.

M vention consists of valve-motion applic to stationary and locomotiveengines, in w h the mechanism controlling the work- 1ng he upper end ofthe pendulum-lever can e )laced in an inclined position on either sidethe middle position, so as to impart a motion to the slide-valve for theforbackward movement of the engine or g motion. position intermediate ofthe two exwill give a greater or less amount of on or expansion, asrequired either for rd or forward gear. ring. to the drawings, Arepresents the I of a locomotive-engine, and B an OS- rod connected atone end to the crank -pin of one of the driving-wheels and ther end tothe working-beam A ato the piston-rod. resents the pendulum-lever, whichis pivot at its lower end to the rod B. The lift 0 1 is pendulum-leveris determined by. the a stment of an adjustable lever-bar, E, the 1rmediate connection between the two eing effected by means of the lever-D. The latter of these rods, D, is

pivot at one end to the lever E, and at its other d it is pivoted to therod D. This rod D is I pivoted to lever E in the same way as the r D,but is adapted to work through an eye, hich is swiveled to the lever E.As show he pendulum-lever O is pivoted to the whereby it will be guidedand controlle nits movement.

To, oscillating lever E is connected the rever g lever E, for shiftingthe position of the le 1 E, said lever E engaging with the wn notchedsector or screw-reversing ITED STATES pecification formingpart ofLetters Patent No. 202,222, dated April 9, 1878;

August 24,1877.

improvement is fully set forth in the PATENT OFFICE.

CHARLES BRO N, or WINTERTHUR, SWITZERLAND.

I M'PROVEMENT IN VALVE-GEARS- FOR ENGINES.

application filed To the lever G, at the point E, which is just belowthe place of connection with lever-rods DD of the lever E, there ispivoted a rod, B, which is connected to the stem of the slidevalve orother operating mechanism of the valve.

In Fig. 2 the valve-motion is shown as applied to a stationary engine.In this case the pendulum-lever O is attached at its lower end to anoscillating rod, B, (shown in dotted lines,) one end of said rod beingpivoted to the crank-arm or working-beam A of the engine, and the otherto a swinging arm, B, suitably mounted. The rod B, which is pivoted tothe pendulum-lever O, is connected to a tappet which operates theelbow-lever of the valves; but the operation is similar to that statedabove.

It will be seen that by my invention the position of the lever Eregulates the magnitude or extent of the lift of the point F, which hasto travel through a more or less elliptical orbit, and'it thus controlsthe movement of the valve.

it will also be seen that this gear or motion is acting in the capacityof expansion and link gear. As an expansion gear it offers, comparedwith ordinary arrangements, the advantage that it renders possible tocreate more degrees of expansion and a more accurate distribution ofsteam. As a link-gear its construction is advantageous, because thehandling of thelink-gear lever is quite easy, requiring less strengthand effort of the operator than the ordinary connecting-gear accompaniedby the counter-guide, and it is easy to obviate the detrimentalinfluence of short guiding-rods on the precise distribution of steam, byraising and lowering the upper extremity of the pendulum-rod through aslight adjustment of the joints of the oscillating lever E. This lever Emay be placed in an inclined position on either side of the middleposition, so as to impart a suitable motion to the valve for thereversing motion.

It is evident that any position of the two extremes will give a greateror less amount of admission or expansion, as required either forbackward or forward gear.

Where the pendulum-lever is worked from a coupling-rod, the motioncommunicated to the valve is slightly incorrect-that is to say, theadmission is not perfectly equal on both sides of the piston; but inapplying my valvegear to engines where the motion of the piston istransmitted to the driving-wheels by means of a working-beam, one end ofthe crank-connecting rod is compelled to move in a circular arc by beingattached to one end of the working-beam.

Now, as the pendulum-lever is attached to the connecting-rod at asuitable point between the crank-pin and working-beam, the error due tothe curve described by the lower end of said pendulum-lever may be sofar overcome that the distribution of steam in the cylinder is nearlymathematically correct for any notch of the sector.

CHARLES BROWN.

1n presence of- FERDINAND VEITH, T. T. SOHKPPI.

